Nah not necessarily, partnerships could work. Ubitus, for example, is already saying many more big 3rd party games will be coming to Switch via their servers. Even without having servers as their own, a 3rd party company bringing them over is just as effective. They only get a cut of the profits, but Nintendo does not need to worry about any headaches on the server end of things. Plus these cloud versions are essentially PC ports with controller inputs, making it worthwhile for 3rd parties to bring the games over as even minimal sales will equal profit.
The real question is not so much who owns the servers, but more who has the most accepted business model for the games.
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